这种变形可能是通过外部控制或自发产生，例如，对温度、压力、和速度的改变做出反应。
The change can be instigated by an external control or it can be automatic, for instance in response to variations in heat, pressure or velocity.
这种变形可能是通过外部控制或自发产生，例如，对温度、压力、和速度的改变做出反应。
The change can be instigated by an external control or it can be automatic, for instance in response to variations in heat, pressure or velocity.
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